Narrow-ware loom.



PATENTED JULY 21 0. W.'SOHA'UM. NARROW WARE LOOM. APPLICATION FILED DEG. 21,1907.

INVENTOR WITNESSES:

ITTORNE'K OTTO W. SOHAUM, OF PHILADELPHIA, PENNSYLVANIA.

NARROW-WARE LOOM.

Specification of Letters Patent.

Patented July 21, 1908.

Application filed December 21, 1907. Serial No. 407,572.

To all whom it may concern:

Be it known that I, OTTO W. SOHAUM, a citizen of the United States, residing in Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented an Improvement in Narrow Ware Looms, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The invention to be hereinafter described relates to narrow-ware looms, and more particularly to the back racks and let-ofi motion thereof.

The object of the invention is to provide a back-rack for supporting the warp-spools and the friction let-off devices whereby the tension of the warp threads is more evenly maintained and, at the same time, without special appliances the spools are retained upon their supporting spindles, and is designed as an improvement onthe structure of Patent 744,440, Nov. 17, 1903.

The invention consists of the novel features and combinations as will hereinafter more fully appear in connection with a described embodiment of the invention.

In the drawings: Figure 1 is a side view of so much of the loom frame and connected parts as necessary to show the invention applied thereto, the top castle or roller box frame being shown in section. Fig. 2 is a detached section of the framing looking from the rear of Fig. 1 and showing a back-rack with the friction disks mounted on the spool s indles. Fig. 3 is a detached detail in side e evation, a part section of a spool and its friction let-off controlling device. Fig. 4 is a detached detail in section of the friction ad and its manner of connection with the f fiction brake or shoe, and Fig. 5 is a detail plan view showing the off-set of the levers.

In the drawings: A represents the frame of the ribbon or narrow-ware loom, which may be understood to be of the ordinary or any a proved construction and equipped with t e usual loom operating devices.

Mounted at the rear of the loom frame upon the cross bars 1, 2, are the back-racks, designated as a whole by the letter B. The back-racks are attached adjustably to the loom frame by means of the slots 3, 4, and suitable attaching devices, whereby the back-racks may be moved toward the one or the other side of the loom into proper adj usting relation with the companion backracks. Each back-rack B is provided with a series of spool supporting pins or spindles 5 upon each of which is loosely mounted a friction wheel 6, said friction wheel 6 being supplied with'suitable holes or perforations 7 to receive the stubs 8 attached to the spool heads, as best shown in Fig. 3. By the construction thus far described, it will be apparent that by rotative movement of the spool due to tension upon the warp threads 9 leading therefrom, the friction wheel 6 will be caused to rotate if free to do so.

In a narrow-ware loom, it is desirable on account of the character of fabric being produced that the tension on the warp threads be maintained as nearly equal at all times as possible, and means are therefore provided as a part of the present invention for securing this end.

Pivotally mounted on the back-racks B adjacent each of the spool spindles 5 is a friction lever 10 pivotally mounted at 11 and provided with a series of teeth 12 to be en gaged by the supporting arm 13 of a weight 14, the end of said lever arms 12 being preferably bifurcated, as fully disclosed in the patent hereinbefore referred to.

In order that the warp may run in a perfectly vertical line without any side deviation whatsoever after it has once arrived at the top castle box the let-01f levers are offset to a point to accomplish this result, as shown in Fig. 5. Were these levers not so off-set there would be a slight sidewise friction through the forks of said levers. This objectionable feature is thus overcome by this construction, wherein as shown in said Fig. 5 the let-off lever is offset so that the center of its slot will be at a point midway between a full and an empty spool.

The short arm of the friction lever 10, see Fig. 4, is preferably formed in the arc of a circle corresponding to the circular contour of the friction wheel 6. This circular portion of the short arm friction lever may be designated for identification the friction shoe 15, and its surface adjacent the friction wheel 6 has formed therein a recess 16 to receive a friction pad 17. This friction ad 17 is preferably formed of leather or ot er resilient material for a purpose that will presentl be described.

T e friction shoe 15 has adjacent its end perforations 18 which receive the downturned ends 19 of the friction pad. This friction pad 17 is preferably formed of leather which is put in place by first soaking the leather in water and turning the ends 19 into the holes 18 of the friction shoe, leaving it under pressure in this condition until it has set to proper position.

It will be noted that the friction pad 17 is attached to the friction shoe at only the two points where the ends thereof turn into the holes 18 of the friction-shoe and that by this construction there is a constant tendency of the friction pad 17 to yieldingly rise from its seat at the central portion of the friction shoe, this being due to the abrupt turns of the pad at the points 20.

The friction wheel 6 has its periphery grooved as at 21 in general conformity with the sectional contour of the friction pad 17, and said pad 17 is yieldingly maintained in the groove 21 by the weight 14 until the tension on the warp threads lift the weight 22 which, engaging with the forked end 23 of the lever 10 will lift the long arm of the lever and thus decrease the frictional pressure of the pad 17 against the friction wheel 6. At this time, depending upon the tension eX- erted upon the warp threads, the spool 24 containing the warp thread will be rotated more or less, but undue or jerky motion of said rotation will be restrained by the pad 17, which, as the long arm of the lever 10 is lifted, rises slightly from its seat at the central portion of the friction shoe 15 and still maintains frictional engagement with the friction wheel 6, though of decreased resistance.

It will be noted that the friction pad 17 at no time entirely vacates the corresponding groove 21 in the friction wheel 6, and, therefore, said friction pad acts not only as an accurate friction controlling means for the rotation of the spool 24 but likewise to prevent movement of the spool endwise of the spindle 5, and that said friction pad 17, by its rising or yielding movement at its central portion, due to the abrupt turns 20 at its ends, will act yieldingly against the friction wheel, even though the long arm of the lever be raised by the warp threads.

In order that the parts may be properly connected together, the weight 14 may be provided with an eye 25 whichwill pass over the bifurcated ends of the lever arm 10 when the weight is turned horizontally, but will not pass thereover when it is in its vertical or natural position. Likewise, the connection of the lever 10 and the back-rack B may be made by a cotter pin 11 acting as the pivotal connection between them.

From the character of the friction pad and its connection with the friction shoe, an easy, steady and reliable tension is always maintained upon the warp threads and all sudden release and stoppage of the spool rotation is avoided, thereby resulting in an even character of fabric and a perfect product.

Having thus described the invention, what I claim and desire to secure by Letters Patent is:

1. In a narrow-ware loom, the combination of a spool spindle, a friction Wheel loosely mounted thereon, a friction lever having a friction shoe, said shoe being provided with a holding socket near each end, a friction pad sustained by said friction shoe and having its ends turned into and held by said sockets, and means under control of the warp threads for varying the pressure of said friction pad upon the friction Wheel.

2. In a narrow-ware loom, the combination of a spool spindle, a friction wheel having a grooved periphery, a friction lever having a friction shoe extending about said friction wheel, said shoe having a recess extending lengthwise thereof and a holding socket at each end of said recess, and a friction pad seated in said recess and having its ends ex tending into and held by said sockets so that the portion of the friction Pad between the ends will tend to move outward from the recess and retain engagement with the groove of the friction wheel when the friction shoe is moved away-from thefriction wheel.

3. In a narrow-ware loom, the combination of a back-rack having a spool spindle fixed thereto, a grooved friction wheel loosely mounted on said spindle, a friction lever having a friction shoe provided with a holding socket near each end thereof, a friction pad formed of elastic material having its ends turned into and held by the sockets of the friction shoe to thereby secure the pad to the shoe and cause the central portion to rise from the shoe when pressure on the pad is decreased, and means under control of the warp threads to decrease the pressure between the friction pad and grooved friction wheel as the tension of the warp threads is increased.

4. In a narrow-ware loom, the combination of a spool spindle, a friction wheel loosely mounted thereon, a friction lever formed with an ofiset forked end and having a friction shoe, said shoe being provided with a socket near each end, a friction pad sustained by said friction shoe and having its ends turned into said sockets, and means under control of the warp threads for varying the pressure of said friction pad upon the friction wheel.

5. In a narrow-ware loom, the combination of a series of spindles, a friction wheel loosely mounted on each of said spindles,

friction levers each formed with an ofiset In testimony whereof, I have signed my forked end and each having a friction shoe, name to this specification, in the presence of 10 each of said shoes being provided With a two subscribing Witnesses.

socket near its end, a friction pad sustained 5 by said shoe and having its ends turned into OTTO SOHAUM' said sockets, and means under control of the Witnesses: Warp threads for bearing the pressure of said L. M. LENTZ,

friction pad upon the friction Wheels, B. G. ELLIOTT. 

